<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
      <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <title>别踩白块</title>
    <link rel="stylesheet" href="css/index.css" />
  </head>
  <body>
    <h2>score</h2>
    <h2 id="score">0</h2>
    <div id="main">
      <div id="con"></div>
    </div>
    <div class="btn">
      <button class="start" onclick="start()">
        开始游戏
      </button>
    </div>
  </body>
  <script src="js/index.js"></script>
</html>